Regulating device for arc lamps



Aug. 6,- 1929. F. MEYER REGULA TING DEVICE FOR ARC LAMPS Filed Jan. 28, 1928 Fig. 4

Patented Aug. 6, 1929.

UNITED STATES PATENT OFFICE.

FRANZ MEYER, or JENA, GERMANY, ASSIGNOR TOITHE rum OF CARL ZEISS, or

JENA, GERMANY.

'REGULATING DEVICE FOR ARC LAMPS.

Application filed J'anuary-28, 1926, Serial No.

The present invention relates to a regulating device for are lamps in which, for producing the regulating mot-ion, one uses a motor which continuously runs in the same direction.

According to the invention one attains a particularly simplified regulating device of this kind, by which also a comparatively quick lighting of the arc may be effected, by disposing between the carbons and the motor a gear, which converts the revolving motion of the motor into an oscillating motion, and by providing between this gear and the carbons a disengaging gear, which is actuated by a differential relay in such a way, that a part of the gear moving forward and backwards is coupled to the carbons either during the forward or the backward motions according as the arc-voltage or the intensity of current in thecarbons exceeds the normal measure.

In order to attain the greatest possible simplicity of construction it is suitable to make the aforesaid disengaging gear consist of a switch wheel and two jacks, which are supported on a part of the gear, moved forward and backwards by the motor, in such a way that the one of them, during the forward motion of the gear, is capable of rotating the switch wheel in the one direction and the other one, during the backward motion, in the other direction. Besides, it is suitable to fix also the two magnets ofthe differential relay on the part of the gear moved forward and backwards, of which magnets the one regulates the meshing of the one jack and the other one the meshing of the other ack with the switch wheel.

The annexed drawing shows a constructional example of a regulating device accord ing to the present invention. Fig. 1 of the drawing represents a plan of the whole device, Fig. 2 a section on the line 2-2 of Fig. 1 and Fig. 3 a section on the line 33 of Fig. 2, whereby Figs. 2 and 3 are drawn on a. larger scale than Fig. 1. Fig. 4 is a side elevation of the device.

The device shown has a base plate a upon which is supported a screw-spindle b, partly provided with a left-handed and partly with a right-handed thread. This spindle serves for the relative displacement of two carbon holders 0 and (Z, of which the first-mentioned one, destined for holding the 250,319, and in Germany February 14, 1 927.

negative carbon 0 is disposed on the part of the spindle 6, provided with a left-handed thread, and the second one, destined for holding the positive carbon (P, on the part provided with a right-handed thread. Parallel to the spindle b are disposed two bars 6 and 7, serving for the guide of the carbon holders. On the spindle, which is rotatable in two bearing brackets g and 9 is fixed a switch wheel l1. Beside the latter there is rotatably supported on the spindle a plate i' on which are fixed two magnets k and k and on which are rotatably supported a double jack l1, about a bolt 1' as well as two bell-crank levers l and Z about bolts 1? and 11 The two magnets, of which the first, k ,'is to be connected in series with the carbons of the are lamp, while the second One, 1:5 should beconnected parallel to the carbons, are provided with an armature each is, of which the one is hingedly connected to the bell-crank lever Z and the other to the bell-crank lever P. The two armatures are held by two draw springs k and k in that position shown in which they are lifted off the magnets as long as none of the magnets is excited. On the jack k acts a rod m which is linked on a crank m fixed on a shaft m By means of a worm wheel m the shaft m is connected to the rotor of an electromotor n.

The device shown is operated in the following manner. W'hen switching on the circuit of the arc lamp one simultaneously switches on the motor whose rotor then continuously revolves in the same direction and puts the jack l1 and thereby the plate i with the magnets k and It over the crank gear into oscillating motion. In the position shown of the magnet armatures 7c the jack It forms with the plate a' a rigid complete body. The double jack h then engages neither during the forward motion nor during the backward motion in the switch wheel it. If, however, at the moment of the switching-on the two carbons are, e. g. too far apart, so that the arc-voltage is too high, the magnet Zr attracts its armature. Owing to the rotation caused thereby of the lever F, the jack 7L glides off this lever and engages with its right-hand (see Fig. 2) knife edge in the switch wheel it every time when the connecting rod an. (see also Fig. 2) moves to the right. Thereby on each such motion the spindle b, as seen from switch wheel, is rotated to the left and in this manner the carbons c and (I approach each other until the proper position of the carbons is attained. Thcreupon, the magnet /r'-' releases its armature and the jack resumes the position shown in which it does not engage anymore in the switch wheel. If, however, during the motion just mentioned the carbons have approached too far or if, prior to the switching-on, their distance apart was too small, the magnet it attracts its armature and the jack it glides olf the bell-crank lever Z Thereby the lefthand knit'e edge (see- Fig. .2) engages in the switch wheel I: when the connecting rod 121- (scc also Fig. moves to the left. Consequently the spindle as seen from the switch wheel Z1, is rotated to the right and the carbons separate from each other.

I claim:

1. A regulating device for are lamps, comprising two carbon holders displaceably disposed, a motor, a gear interposed between the motor and the carbon holders and adapted to convert the revolving motion of the motor into an oscillating motion, a disengaging gear inserted between the first said gear and the carbon holders, and a differential relay adapted to actuate the said disengaging gear in such a way that it is coupled to the carbon holders either during the forward or the backward strokes of the oscillations. I

2. A regulating device for are lamps, comprising two carbon holders displaceably disposed, a motor, a member, displaceably disposed, a gear interposed between the motor and the said member and adapted to impart to the said member an oscillating motion, a switch wheel and two jacks adapted to coact with this switch wheel, the switch wheel and the jacks being disposed on the said member, and a differential relay adapted to bring in mesh the one or the other jack with the switch wheel.

FRANZ MEYER. 

